dilute
US /daɪˈluːt/
UK /daɪˈluːt/

1.
make (a liquid) thinner or weaker by adding water or another solvent to it
:
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You should dilute the juice with water before drinking.
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The paint needs to be diluted for a smoother application.
1.
(of a liquid) made thinner or weaker by having had water or another solvent added to it
:
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The chemist prepared a dilute solution of acid.
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Always use dilute bleach for cleaning to avoid damage.